Remove more oilpan.

sky/engine/core/loader/ImageLoader.h

Index: sky/engine/core/loader/ImageLoader.h
diff --git a/sky/engine/core/loader/ImageLoader.h b/sky/engine/core/loader/ImageLoader.h
index ef5951bbc82b8b5e0da4ff0af6828b0523022985..b9c4629e39f79d5ed4173909d97c0b14e04d1e59 100644
--- a/sky/engine/core/loader/ImageLoader.h
+++ b/sky/engine/core/loader/ImageLoader.h
@@ -37,7 +37,7 @@ class IncrementLoadEventDelayCount;
 class FetchRequest;
 class Document;
 
-class ImageLoaderClient : public DummyBase<void> {
+class ImageLoaderClient {
 public:
     virtual void notifyImageSourceChanged() = 0;
 
@@ -57,7 +57,7 @@ class RenderImageResource;
 template<typename T> class EventSender;
 typedef EventSender<ImageLoader> ImageEventSender;
 
-class ImageLoader : public DummyBase<ImageLoader>, public ImageResourceClient {
+class ImageLoader : public ImageResourceClient {
 public:
     explicit ImageLoader(Element*);
     virtual ~ImageLoader();